While the Christian Scripture states that among the signs that will be displayed by those who believe is that they shall drink poison and it shall not harm them, Islam teaches that this is not a necessary sign of Faith, nevertheless, those individuals with a high degree of faith may drink poison as a demonstration of the veracity of our Religion and the truth of the Prophet Muhammad صلى الله عليه وآله وسلم
How does drinking poison and not dying demonstrate "the veracity of your religion" or "the truth of the Prophet Muhammad"?
If I start a religion right now, and declare that my followers won't die if they drink poison, and then one of them drinks poison and doesn't die - does that demonstrate that their survival had anything to do with my or their religion?